# ps5-1 - will study in detail later in the course At the...

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Assignment 5 Phys1112 Spring 2010 Due March 1. Y&F: 6.12, 6.18, 6.38, 6.50, 6.100 Problem 6 A block of mass m slides down a ramp, inclined at an angle θ above the horizontal. The coe ffi cient of static friction is μ s . Suppose the block slides a distance D along the ramp. (a) What is the work done by the friction? (b) Work done by gravity? (c) Work done by normal force? (d) What is the speed of the block after sliding the distance D ? Problem 7 The gravitational force of the earth on an object is inversely proportional to the square of the distance from the center of the earth. (This is Newton’s law of gravitation which we
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Unformatted text preview: will study in detail later in the course.) At the surface of the earth this force, as we know, is mg . If an object falls to earth from a great distance away, what is its speed when it strikes the earth? (Assume the object initially had zero speed.) Problem 8 A block of mass m slides along a horizontal surface with coe±cient of kinetic friction μ k . It collides into a horizontal spring with spring constant k with an initial velocity v . Over what distance does it travel before coming momentarily to a stop? 1...
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